Comparison of Orthodontic Diagnostic Elements Obtained From Laser-scanned Digital Models and Plaster Models

Objectives: The aim of this study is to compare the diagnostic elements including Angle molar and canine class, overbite, overjet, midline deviation, crowding and spacing, and crossbites obtained from laser-scanned digital models to those taken from plaster models.
Methods: Plaster models were prepared from thirty-two patients. Plaster models were scanned using the OrthoInsight 3D laser scanner. Each of the three orthodontists evaluated thirty-two plaster models in random order and recorded Angle molar and canine class, overbite, overjet, midline deviation, crowding and/or spacing, and crossbites. Using OrthoInsight 3D software, the three orthodontists evaluated and recorded the diagnostic values from the laser-scanned digital models in same manner. Descriptive statistics and intraclass correlation coefficient (ICC) test were used to analyze the obtained data.
Results: ICC result demonstrates excellent agreement between laser-scanned digital models and plaster models in molar Angle classes, overjet, overbite, crowding/spacing, and anterior crossbite. Mean differences in overjet, overbite, and midline deviation are 0.13±1.27mm, 0.15±0.721mm, and 0.016±0.826mm, respectively.
Conclusions: In conclusion, orthodontic diagnostic elements values obtained from laser-scanned digital models are highly correlated to those obtained from the plaster models. This result provides clinicians with an additional alternative diagnostic record method to take into consideration in orthodontic diagnosis and treatment planning.